ref: c0dfecfb893c8399b97970239689bf53bfe49096
dir: /vp9/encoder/vp9_extend.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "vpx_mem/vpx_mem.h"
#include "vp9/common/vp9_common.h"
#include "vp9/encoder/vp9_extend.h"
static void copy_and_extend_plane(const uint8_t *src, int src_pitch,
uint8_t *dst, int dst_pitch,
int w, int h,
int extend_top, int extend_left,
int extend_bottom, int extend_right) {
int i, linesize;
// copy the left and right most columns out
const uint8_t *src_ptr1 = src;
const uint8_t *src_ptr2 = src + w - 1;
uint8_t *dst_ptr1 = dst - extend_left;
uint8_t *dst_ptr2 = dst + w;
for (i = 0; i < h; i++) {
vpx_memset(dst_ptr1, src_ptr1[0], extend_left);
vpx_memcpy(dst_ptr1 + extend_left, src_ptr1, w);
vpx_memset(dst_ptr2, src_ptr2[0], extend_right);
src_ptr1 += src_pitch;
src_ptr2 += src_pitch;
dst_ptr1 += dst_pitch;
dst_ptr2 += dst_pitch;
}
// Now copy the top and bottom lines into each line of the respective
// borders
src_ptr1 = dst - extend_left;
src_ptr2 = dst + dst_pitch * (h - 1) - extend_left;
dst_ptr1 = dst + dst_pitch * (-extend_top) - extend_left;
dst_ptr2 = dst + dst_pitch * (h) - extend_left;
linesize = extend_left + extend_right + w;
for (i = 0; i < extend_top; i++) {
vpx_memcpy(dst_ptr1, src_ptr1, linesize);
dst_ptr1 += dst_pitch;
}
for (i = 0; i < extend_bottom; i++) {
vpx_memcpy(dst_ptr2, src_ptr2, linesize);
dst_ptr2 += dst_pitch;
}
}
void vp9_copy_and_extend_frame(const YV12_BUFFER_CONFIG *src,
YV12_BUFFER_CONFIG *dst) {
// Extend src frame in buffer
// Altref filtering assumes 16 pixel extension
const int et_y = 16;
const int el_y = 16;
// Motion estimation may use src block variance with the block size up
// to 64x64, so the right and bottom need to be extended to 64 multiple
// or up to 16, whichever is greater.
const int eb_y = MAX(ALIGN_POWER_OF_TWO(src->y_width, 6) - src->y_width,
16);
const int er_y = MAX(ALIGN_POWER_OF_TWO(src->y_height, 6) - src->y_height,
16);
const int uv_width_subsampling = (src->uv_width != src->y_width);
const int uv_height_subsampling = (src->uv_height != src->y_height);
const int et_uv = et_y >> uv_height_subsampling;
const int el_uv = el_y >> uv_width_subsampling;
const int eb_uv = eb_y >> uv_height_subsampling;
const int er_uv = er_y >> uv_width_subsampling;
copy_and_extend_plane(src->y_buffer, src->y_stride,
dst->y_buffer, dst->y_stride,
src->y_width, src->y_height,
et_y, el_y, eb_y, er_y);
copy_and_extend_plane(src->u_buffer, src->uv_stride,
dst->u_buffer, dst->uv_stride,
src->uv_width, src->uv_height,
et_uv, el_uv, eb_uv, er_uv);
copy_and_extend_plane(src->v_buffer, src->uv_stride,
dst->v_buffer, dst->uv_stride,
src->uv_width, src->uv_height,
et_uv, el_uv, eb_uv, er_uv);
}
void vp9_copy_and_extend_frame_with_rect(const YV12_BUFFER_CONFIG *src,
YV12_BUFFER_CONFIG *dst,
int srcy, int srcx,
int srch, int srcw) {
// If the side is not touching the bounder then don't extend.
const int et_y = srcy ? 0 : dst->border;
const int el_y = srcx ? 0 : dst->border;
const int eb_y = srcy + srch != src->y_height ? 0 :
dst->border + dst->y_height - src->y_height;
const int er_y = srcx + srcw != src->y_width ? 0 :
dst->border + dst->y_width - src->y_width;
const int src_y_offset = srcy * src->y_stride + srcx;
const int dst_y_offset = srcy * dst->y_stride + srcx;
const int et_uv = ROUND_POWER_OF_TWO(et_y, 1);
const int el_uv = ROUND_POWER_OF_TWO(el_y, 1);
const int eb_uv = ROUND_POWER_OF_TWO(eb_y, 1);
const int er_uv = ROUND_POWER_OF_TWO(er_y, 1);
const int src_uv_offset = ((srcy * src->uv_stride) >> 1) + (srcx >> 1);
const int dst_uv_offset = ((srcy * dst->uv_stride) >> 1) + (srcx >> 1);
const int srch_uv = ROUND_POWER_OF_TWO(srch, 1);
const int srcw_uv = ROUND_POWER_OF_TWO(srcw, 1);
copy_and_extend_plane(src->y_buffer + src_y_offset, src->y_stride,
dst->y_buffer + dst_y_offset, dst->y_stride,
srcw, srch,
et_y, el_y, eb_y, er_y);
copy_and_extend_plane(src->u_buffer + src_uv_offset, src->uv_stride,
dst->u_buffer + dst_uv_offset, dst->uv_stride,
srcw_uv, srch_uv,
et_uv, el_uv, eb_uv, er_uv);
copy_and_extend_plane(src->v_buffer + src_uv_offset, src->uv_stride,
dst->v_buffer + dst_uv_offset, dst->uv_stride,
srcw_uv, srch_uv,
et_uv, el_uv, eb_uv, er_uv);
}